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MATLAB symbolic function shouldn't be symbolic

  1. Oct 29, 2008 #1

    I am getting this error when I try to run the code (at bottom):

    check =


    ??? Undefined function or method 'gt' for input arguments of
    type 'sym'.

    Error in ==> hw at 15
    if check > 10

    The value "check" seems to be a real value, not symbolic. It outputs a value of 1 in the terminal. Can anyone help me resolve this problem?


    clear all
    syms z p x;
    z = -10;
    p = 0;
    while p <20
    while z < 20
    G1 = tf([1 z],[1 p]);
    X1 = (x+z)/(x+p);
    G2 = tf([1],[1 2.5 1]);
    X2 = (1/(x^2+2.5*x+1));
    TF = G1*G2/(1+G1*G2);
    XF = X1*X2/(1+X1*X2);
    z = z + .1;
    check = limit(XF,x,0)
    if check > 10

    [Wn,Z] = damp(TF)

    p = p+.1;
    Last edited: Oct 29, 2008
  2. jcsd
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